The Desigh And Implementation Of Transmission And Receiving At Command In4G Network PC Side

Due to the rapid development of communications technology, we are gradually moving towards4G communications era, at the same time, with the development of information technology, mobile phone has become the people daily life indispensable communication tool, has broad prospects for development, so in4G communication system, realizing each function of mobile phone is the important weights for getting the future mobile phone market, and realizing data interaction between mobile phone and computer is very important.Due to previous data interaction between mobile phone and computer is mainly through the interaction between MMI and protocol stack, MMI directly call stack application program interface function, but once the mobile terminal extend functions or change into different protocol stacks, you must modify all function code of protocol stack and add the new program interface, the workload is very large and complex, it does not conform to development requirements for the module independence.Based on the above needs between the practical application and development, it can solve the demand that the AT command is applied to the interaction between the MMI and the protocol stack. When need to upgrade and transplant protocol stack, it only need to modify the AT command interface simply, MMI itself is without any modification.The main work of the paper is AT command design and implementation for the mobile phone in a4G communication system. Firstly, the paper introduces the background of the subject, significance and the status of AT command at home and abroad. Then the paper describes the4G communication system and AT command related technology. This paper introduces the overall framework of AT command module, AT command parsing process, the design and the implementation of every sub-module based the needs. Finally the paper explains several methods of system test, analysis and debug. The paper follows the software engineering specification strictly.According to the results of the tests, this interactive system achieves the requirements. It has expansibility, transplant and practical values.